When is the last frost in Palmdale, CA?

The average last spring frost (50% probability of 32°F) in Palmdale is around March 13, based on NOAA/NCEI 1991–2020 normals at the Pearblossom, CA station (11.3 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Palmdale?

The average first fall frost in Palmdale, CA is around December 1, giving roughly a 258-day frost-free growing season.

What planting zone is Palmdale, CA?

Palmdale is in USDA plant hardiness zone 9a (average annual extreme minimum temperature 20 to 25°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Palmdale?

In Palmdale, CA the warmest month is July (avg high 98.7°F) and the coldest is December (avg low 36.4°F). It averages about 6.8″ of precipitation a year and 1″ of snow.

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Palmdale, CA Planting Calendar & Frost Dates

USDA hardiness zone 9a · ZIP 93550 · elevation 945′ · NOAA & USDA data

Palmdale is in USDA hardiness zone 9a (winters can dip to 20 to 25°F), with a growing season of about 258 days between the average last spring frost (March 13) and first fall frost (December 1). The warmest month is July (avg high 98.7°F); the coldest is December (avg low 36.4°F). It averages 6.8″ of precipitation a year and 1″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 20 to 25°F

Last spring frost

March 13

avg (50% prob, 32°F)

First fall frost

December 1

avg (50% prob, 32°F)

Growing season

258 days

frost-free window

Warmest month

July

avg high 98.7°F

Month-by-month typical weather in Palmdale

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Pearblossom, CA (11.3 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	59.7	37.5	48.6	1.2	0.2
February	62.8	38.9	50.8	1.6	0
March	68.7	42.4	55.6	1	0
April	75	45.5	60.2	0.3	0
May	83.6	52.7	68.1	0.3	0
June	93	60.7	76.9	0	0
July	98.7	67.5	83.1	0.2	0
August	98	67	82.5	0.1	0
September	91.4	61.6	76.5	0.2	0
October	79.8	53.1	66.5	0.3	0
November	67.4	43	55.2	0.5	0.2
December	58.1	36.4	47.3	1.2	0.6

What to plant when in Palmdale

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: January 30 · Transplant out: March 20
Peppers	warm	Start seeds indoors: January 16 · Transplant out: March 27
Cucumbers	warm	Direct sow: March 20
Zucchini / squash	warm	Direct sow: March 20
Bush beans	warm	Direct sow: March 20
Sweet corn	warm	Direct sow: March 20
Basil	warm	Transplant out: March 20
Peas	cool	Sow (spring): February 6 · Sow (fall): October 6
Spinach	cool	Sow (spring): January 30 · Sow (fall): October 6
Lettuce	cool	Sow (spring): February 13 · Sow (fall): October 6
Kale	cool	Transplant (spring): February 20 · Sow (fall): September 22
Broccoli	cool	Transplant (spring): February 27
Carrots	cool	Sow (spring): February 20 · Sow (fall): September 22
Onions	cool	Transplant (spring): February 13
Potatoes	cool	Plant seed potatoes: February 27
Radishes	cool	Sow (spring): February 13 · Sow (fall): October 20

Dates are computed from Palmdale's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

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Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Pearblossom, CA, 11.3 mi (confidence: medium). Monthly weather normals: Pearblossom, CA, 11.3 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.